Quy Hoang Van, Truyen Dang Hai, Kim Sangmo, Bark Chung Wung
Department of Electrical Engineering, Gachon University, Seongnam 13120, Korea.
Materials (Basel). 2021 Jan 29;14(3):629. doi: 10.3390/ma14030629.
The electron transport layer (ETL) of organic-inorganic perovskite solar cells plays an important role in their power conversion efficiency (PCE). In this study, TiO hollow nanospheres with a diameter of 150 nm were prepared by a facile synthesis method. The synthesized TiO hollow nanospheres had a highly porous structure with a surface area of 85.23 m g, which is significantly higher than commercial TiO (P25) (54.32 m g), indicating that they can form an ideal mesoporous layer for Formamidinium iodide-based perovskite solar cells (PSCs). In addition, the nanospheres achieved a remarkable perovskite performance, and the average PCE increased from 12.87% to 14.27% with a short circuit current density of 22.36 mAcm, an open voltage of 0.95 V, and a fill factor of 0.65. The scanning electron microscopy images revealed that the enhanced PCE could be due to the improved carrier collection and transport properties of the nanosphere, which enabled efficient filtration of perovskite into the TiO mesoporous ETL. The TiO hollow nanospheres fabricated in this study show high potential as a high-quality ETL material for efficient (FAPbI)(MAPbBr)-based PSCs.
有机-无机钙钛矿太阳能电池的电子传输层（ETL）在其功率转换效率（PCE）中起着重要作用。在本研究中，通过一种简便的合成方法制备了直径为150nm的TiO中空纳米球。合成的TiO中空纳米球具有高度多孔的结构，表面积为85.23m²/g，显著高于商用TiO（P25）（54.32m²/g），这表明它们可为基于碘化甲脒的钙钛矿太阳能电池（PSC）形成理想的介孔层。此外，这些纳米球实现了卓越的钙钛矿性能，平均PCE从12.87%提高到14.27%，短路电流密度为22.36mA/cm²，开路电压为0.95V，填充因子为0.65。扫描电子显微镜图像显示，PCE的提高可能归因于纳米球载流子收集和传输性能的改善，这使得钙钛矿能够有效地过滤到TiO介孔ETL中。本研究中制备的TiO中空纳米球作为基于高效（FAPbI）（MAPbBr）的PSC的高质量ETL材料具有很高的潜力。
